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Poul Pedersen Laigaard, Mathias Hvidtfelt, Inger Christine Munch, Michael Larsen; Reading speed and acuity in a cohort of 16-year-old children from the population-based Copenhagen Child Cohort 2000 Study tested with Radner Reading Chart. Invest. Ophthalmol. Vis. Sci. 2017;58(8):2409.
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© ARVO (1962-2015); The Authors (2016-present)
The Radner Reading Chart for measuring reading speed and reading acuity has been developed and tested in multiple languages and consists of charts with 14 text pieces of 14 words printed in blocks of decreasing size. In this study, we used the Radner Reading Chart to assess the reading properties of 16-year-old Danish Children
151 participants from the population-based Copenhagen Child Cohort 2000 study were included and asked to read aloud all texts of a selected chart from the Danish version of the Radner Reading Chart as fast as possible at a distance of 40 cm. We also measured best corrected visual acuity at 4 meter (ETDRS), axial length and subjective refraction and collected information about dyslexia and the use of glasses.The results were analyzed with respect to reading acuity (logRAD), reading speed and critical print size, defined as the print size where the reading speed decreases. The participants were divided into quartiles based on their average reading speed for the 6 medium font size texts (print size logRAD 0.9 to 0.4, corresponding to Snellen acuity thresholds 0.13 to 0.4)
All participants were able to read the texts to the font size corresponding to logRAD 0.3 (Snellen 0.5), 120 participants read to logRAD 0.0 (Snellen 1.0), 49 to logRAD -0.1 (Snellen 1.3) and 5 to logRAD -0.2 (Snellen 1.6). The average reading speed for the 6 medium-sized texts was 120±25.7 (range 58.9 to 177) words per minute (wpm) and the critical print size at which the average reading speed started to decrease from 111 wpm to 80.8 wpm was logRAD 0.1 (Snellen 0.8).We found no difference between the slowest and fastest reading quartiles of participants in 4-meter-visual acuity (91.3 ± 4.66 vs 91.8 ±3.91) ETDRS letters, axial length (23.3 ±0.94 vs 23.5 ±0.93) mm, spherical equivalent refraction (-0.07 ± 1.04 versus -0.30 ±1.1) diopters, gender or the use of refractive correction. Half of the participants in the slowest reading quartile reported being dyslexic, against none in the 3 best-performing quartiles
The 16-year-old participants of the Copenhagen Child Cohort 2000 Study were able to use the Radner Reading Chart. Slow reading was related to self-reported dyslexia but not to distance visual acuity, sex, axial length or use of refractive correction. Reading speed was slower than in previous studies of Danish adults
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
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